text: // SPDX-License-Identifier: GPL-2.0
  /*
   * USB FTDI client driver for Elan Digital Systems's Uxxx adapters
   *
   * Copyright(C) 2006 Elan Digital Systems Limited
   * http://www.elandigitalsystems.com
   *
   * Author and Maintainer - Tony Olech - Elan Digital Systems
   * tony.olech@elandigitalsystems.com
   *
   * This driver was written by Tony Olech(tony.olech@elandigitalsystems.com)
   * based on various USB client drivers in the 2.6.15 linux kernel
   * with constant reference to the 3rd Edition of Linux Device Drivers
   * published by O'Reilly
   *
   * The U132 adapter is a USB to CardBus adapter specifically designed
   * for PC cards that contain an OHCI host controller. Typical PC cards
   * are the Orange Mobile 3G Option GlobeTrotter Fusion card.
   *
   * The U132 adapter will *NOT *work with PC cards that do not contain
   * an OHCI controller. A simple way to test whether a PC card has an
   * OHCI controller as an interface is to insert the PC card directly
   * into a laptop(or desktop) with a CardBus slot and if "lspci" shows
   * a new USB controller and "lsusb -v" shows a new OHCI Host Controller
   * then there is a good chance that the U132 adapter will support the
   * PC card.(you also need the specific client driver for the PC card)
   *
   * Please inform the Author and Maintainer about any PC cards that
   * contain OHCI Host Controller and work when directly connected to
   * an embedded CardBus slot but do not work when they are connected
   * via an ELAN U132 adapter.
   *
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/kernel.h>
  #include <linux/errno.h>
  #include <linux/init.h>
  #include <linux/list.h>
  #include <linux/ioctl.h>
  #include <linux/pci_ids.h>
  #include <linux/slab.h>
  #include <linux/module.h>
  #include <linux/kref.h>
  #include <linux/mutex.h>
  #include <linux/uaccess.h>
  #include <linux/usb.h>
  #include <linux/workqueue.h>
  #include <linux/platform_device.h>
  MODULE_AUTHOR("Tony Olech");
  MODULE_DESCRIPTION("FTDI ELAN driver");
  MODULE_LICENSE("GPL");
  #define INT_MODULE_PARM(n, v) static int n = v;module_param(n, int, 0444)
  static bool distrust_firmware = 1;
  module_param(distrust_firmware, bool, 0);
  MODULE_PARM_DESC(distrust_firmware,
  		 "true to distrust firmware power/overcurrent setup");
  extern struct platform_driver u132_platform_driver;
  /*
   * ftdi_module_lock exists to protect access to global variables
   *
   */
  static struct mutex ftdi_module_lock;
  static int ftdi_instances = 0;
  static struct list_head ftdi_static_list;
  /*
   * end of the global variables protected by ftdi_module_lock
   */
  #include "usb_u132.h"
  #include <asm/io.h>
  #include <linux/usb/hcd.h>
  
  /* FIXME ohci.h is ONLY for internal use by the OHCI driver.
   * If you're going to try stuff like this, you need to split
   * out shareable stuff (register declarations?) into its own
   * file, maybe name <linux/usb/ohci.h>
   */
  
  #include "../host/ohci.h"
  /* Define these values to match your devices*/
  #define USB_FTDI_ELAN_VENDOR_ID 0x0403
  #define USB_FTDI_ELAN_PRODUCT_ID 0xd6ea
  /* table of devices that work with this driver*/
  static const struct usb_device_id ftdi_elan_table[] = {
  	{USB_DEVICE(USB_FTDI_ELAN_VENDOR_ID, USB_FTDI_ELAN_PRODUCT_ID)},
  	{ /* Terminating entry */ }
  };
  
  MODULE_DEVICE_TABLE(usb, ftdi_elan_table);
  /* only the jtag(firmware upgrade device) interface requires
   * a device file and corresponding minor number, but the
   * interface is created unconditionally - I suppose it could
   * be configured or not according to a module parameter.
   * But since we(now) require one interface per device,
   * and since it unlikely that a normal installation would
   * require more than a couple of elan-ftdi devices, 8 seems
   * like a reasonable limit to have here, and if someone
   * really requires more than 8 devices, then they can frig the
   * code and recompile
   */
  #define USB_FTDI_ELAN_MINOR_BASE 192
  #define COMMAND_BITS 5
  #define COMMAND_SIZE (1<<COMMAND_BITS)
  #define COMMAND_MASK (COMMAND_SIZE-1)
  struct u132_command {
  	u8 header;
  	u16 length;
  	u8 address;
  	u8 width;
  	u32 value;
  	int follows;
  	void *buffer;
  };
  #define RESPOND_BITS 5
  #define RESPOND_SIZE (1<<RESPOND_BITS)
  #define RESPOND_MASK (RESPOND_SIZE-1)
  struct u132_respond {
  	u8 header;
  	u8 address;
  	u32 *value;
  	int *result;
  	struct completion wait_completion;
  };
  struct u132_target {
  	void *endp;
  	struct urb *urb;
  	int toggle_bits;
  	int error_count;
  	int condition_code;
  	int repeat_number;
  	int halted;
  	int skipped;
  	int actual;
  	int non_null;
  	int active;
  	int abandoning;
  	void (*callback)(void *endp, struct urb *urb, u8 *buf, int len,
  			 int toggle_bits, int error_count, int condition_code,
  			 int repeat_number, int halted, int skipped, int actual,
  			 int non_null);
  };
  /* Structure to hold all of our device specific stuff*/
  struct usb_ftdi {
  	struct list_head ftdi_list;
  	struct mutex u132_lock;
  	int command_next;
  	int command_head;
  	struct u132_command command[COMMAND_SIZE];
  	int respond_next;
  	int respond_head;
  	struct u132_respond respond[RESPOND_SIZE];
  	struct u132_target target[4];
  	char device_name[16];
  	unsigned synchronized:1;
  	unsigned enumerated:1;
  	unsigned registered:1;
  	unsigned initialized:1;
  	unsigned card_ejected:1;
  	int function;
  	int sequence_num;
  	int disconnected;
  	int gone_away;
  	int stuck_status;
  	int status_queue_delay;
  	struct semaphore sw_lock;
  	struct usb_device *udev;
  	struct usb_interface *interface;
  	struct usb_class_driver *class;
  	struct delayed_work status_work;
  	struct delayed_work command_work;
  	struct delayed_work respond_work;
  	struct u132_platform_data platform_data;
  	struct resource resources[0];
  	struct platform_device platform_dev;
  	unsigned char *bulk_in_buffer;
  	size_t bulk_in_size;
  	size_t bulk_in_last;
  	size_t bulk_in_left;
  	__u8 bulk_in_endpointAddr;
  	__u8 bulk_out_endpointAddr;
  	struct kref kref;
  	u32 controlreg;
  	u8 response[4 + 1024];
  	int expected;
  	int received;
  	int ed_found;
  };
  #define kref_to_usb_ftdi(d) container_of(d, struct usb_ftdi, kref)
  #define platform_device_to_usb_ftdi(d) container_of(d, struct usb_ftdi, \
  						    platform_dev)
  static struct usb_driver ftdi_elan_driver;
  static void ftdi_elan_delete(struct kref *kref)
  {
  	struct usb_ftdi *ftdi = kref_to_usb_ftdi(kref);
  	dev_warn(&ftdi->udev->dev, "FREEING ftdi=%p\n", ftdi);
  	usb_put_dev(ftdi->udev);
  	ftdi->disconnected += 1;
  	mutex_lock(&ftdi_module_lock);
  	list_del_init(&ftdi->ftdi_list);
  	ftdi_instances -= 1;
  	mutex_unlock(&ftdi_module_lock);
  	kfree(ftdi->bulk_in_buffer);
  	ftdi->bulk_in_buffer = NULL;
  }
  
  static void ftdi_elan_put_kref(struct usb_ftdi *ftdi)
  {
  	kref_put(&ftdi->kref, ftdi_elan_delete);
  }
  
  static void ftdi_elan_get_kref(struct usb_ftdi *ftdi)
  {
  	kref_get(&ftdi->kref);
  }
  
  static void ftdi_elan_init_kref(struct usb_ftdi *ftdi)
  {
  	kref_init(&ftdi->kref);
  }
  
  static void ftdi_status_requeue_work(struct usb_ftdi *ftdi, unsigned int delta)
  {
  	if (!schedule_delayed_work(&ftdi->status_work, delta))
  		kref_put(&ftdi->kref, ftdi_elan_delete);
  }
  
  static void ftdi_status_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
  {
  	if (schedule_delayed_work(&ftdi->status_work, delta))
  		kref_get(&ftdi->kref);
  }
  
  static void ftdi_status_cancel_work(struct usb_ftdi *ftdi)
  {
  	if (cancel_delayed_work_sync(&ftdi->status_work))
  		kref_put(&ftdi->kref, ftdi_elan_delete);
  }
  
  static void ftdi_command_requeue_work(struct usb_ftdi *ftdi, unsigned int delta)
  {
  	if (!schedule_delayed_work(&ftdi->command_work, delta))
  		kref_put(&ftdi->kref, ftdi_elan_delete);
  }
  
  static void ftdi_command_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
  {
  	if (schedule_delayed_work(&ftdi->command_work, delta))
  		kref_get(&ftdi->kref);
  }
  
  static void ftdi_command_cancel_work(struct usb_ftdi *ftdi)
  {
  	if (cancel_delayed_work_sync(&ftdi->command_work))
  		kref_put(&ftdi->kref, ftdi_elan_delete);
  }
  
  static void ftdi_response_requeue_work(struct usb_ftdi *ftdi,
  				       unsigned int delta)
  {
  	if (!schedule_delayed_work(&ftdi->respond_work, delta))
  		kref_put(&ftdi->kref, ftdi_elan_delete);
  }
  
  static void ftdi_respond_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
  {
  	if (schedule_delayed_work(&ftdi->respond_work, delta))
  		kref_get(&ftdi->kref);
  }
  
  static void ftdi_response_cancel_work(struct usb_ftdi *ftdi)
  {
  	if (cancel_delayed_work_sync(&ftdi->respond_work))
  		kref_put(&ftdi->kref, ftdi_elan_delete);
  }
  
  void ftdi_elan_gone_away(struct platform_device *pdev)
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	ftdi->gone_away += 1;
  	ftdi_elan_put_kref(ftdi);
  }
  
  
  EXPORT_SYMBOL_GPL(ftdi_elan_gone_away);
  static void ftdi_release_platform_dev(struct device *dev)
  {
  	dev->parent = NULL;
  }
  
  static void ftdi_elan_do_callback(struct usb_ftdi *ftdi,
  				  struct u132_target *target, u8 *buffer, int length);
  static void ftdi_elan_kick_command_queue(struct usb_ftdi *ftdi);
  static void ftdi_elan_kick_respond_queue(struct usb_ftdi *ftdi);
  static int ftdi_elan_setupOHCI(struct usb_ftdi *ftdi);
  static int ftdi_elan_checkingPCI(struct usb_ftdi *ftdi);
  static int ftdi_elan_enumeratePCI(struct usb_ftdi *ftdi);
  static int ftdi_elan_synchronize(struct usb_ftdi *ftdi);
  static int ftdi_elan_stuck_waiting(struct usb_ftdi *ftdi);
  static int ftdi_elan_command_engine(struct usb_ftdi *ftdi);
  static int ftdi_elan_respond_engine(struct usb_ftdi *ftdi);
  static int ftdi_elan_hcd_init(struct usb_ftdi *ftdi)
  {
  	if (ftdi->platform_dev.dev.parent)
  		return -EBUSY;
  
  	ftdi_elan_get_kref(ftdi);
  	ftdi->platform_data.potpg = 100;
  	ftdi->platform_data.reset = NULL;
  	ftdi->platform_dev.id = ftdi->sequence_num;
  	ftdi->platform_dev.resource = ftdi->resources;
  	ftdi->platform_dev.num_resources = ARRAY_SIZE(ftdi->resources);
  	ftdi->platform_dev.dev.platform_data = &ftdi->platform_data;
  	ftdi->platform_dev.dev.parent = NULL;
  	ftdi->platform_dev.dev.release = ftdi_release_platform_dev;
  	ftdi->platform_dev.dev.dma_mask = NULL;
  	snprintf(ftdi->device_name, sizeof(ftdi->device_name), "u132_hcd");
  	ftdi->platform_dev.name = ftdi->device_name;
  	dev_info(&ftdi->udev->dev, "requesting module '%s'\n", "u132_hcd");
  	request_module("u132_hcd");
  	dev_info(&ftdi->udev->dev, "registering '%s'\n",
  		 ftdi->platform_dev.name);
  
  	return platform_device_register(&ftdi->platform_dev);
  }
  
  static void ftdi_elan_abandon_completions(struct usb_ftdi *ftdi)
  {
  	mutex_lock(&ftdi->u132_lock);
  	while (ftdi->respond_next > ftdi->respond_head) {
  		struct u132_respond *respond = &ftdi->respond[RESPOND_MASK &
  							      ftdi->respond_head++];
  		*respond->result = -ESHUTDOWN;
  		*respond->value = 0;
  		complete(&respond->wait_completion);
  	} mutex_unlock(&ftdi->u132_lock);
  }
  
  static void ftdi_elan_abandon_targets(struct usb_ftdi *ftdi)
  {
  	int ed_number = 4;
  	mutex_lock(&ftdi->u132_lock);
  	while (ed_number-- > 0) {
  		struct u132_target *target = &ftdi->target[ed_number];
  		if (target->active == 1) {
  			target->condition_code = TD_DEVNOTRESP;
  			mutex_unlock(&ftdi->u132_lock);
  			ftdi_elan_do_callback(ftdi, target, NULL, 0);
  			mutex_lock(&ftdi->u132_lock);
  		}
  	}
  	ftdi->received = 0;
  	ftdi->expected = 4;
  	ftdi->ed_found = 0;
  	mutex_unlock(&ftdi->u132_lock);
  }
  
  static void ftdi_elan_flush_targets(struct usb_ftdi *ftdi)
  {
  	int ed_number = 4;
  	mutex_lock(&ftdi->u132_lock);
  	while (ed_number-- > 0) {
  		struct u132_target *target = &ftdi->target[ed_number];
  		target->abandoning = 1;
  	wait_1:if (target->active == 1) {
  			int command_size = ftdi->command_next -
  				ftdi->command_head;
  			if (command_size < COMMAND_SIZE) {
  				struct u132_command *command = &ftdi->command[
  					COMMAND_MASK & ftdi->command_next];
  				command->header = 0x80 | (ed_number << 5) | 0x4;
  				command->length = 0x00;
  				command->address = 0x00;
  				command->width = 0x00;
  				command->follows = 0;
  				command->value = 0;
  				command->buffer = &command->value;
  				ftdi->command_next += 1;
  				ftdi_elan_kick_command_queue(ftdi);
  			} else {
  				mutex_unlock(&ftdi->u132_lock);
  				msleep(100);
  				mutex_lock(&ftdi->u132_lock);
  				goto wait_1;
  			}
  		}
  	wait_2:if (target->active == 1) {
  			int command_size = ftdi->command_next -
  				ftdi->command_head;
  			if (command_size < COMMAND_SIZE) {
  				struct u132_command *command = &ftdi->command[
  					COMMAND_MASK & ftdi->command_next];
  				command->header = 0x90 | (ed_number << 5);
  				command->length = 0x00;
  				command->address = 0x00;
  				command->width = 0x00;
  				command->follows = 0;
  				command->value = 0;
  				command->buffer = &command->value;
  				ftdi->command_next += 1;
  				ftdi_elan_kick_command_queue(ftdi);
  			} else {
  				mutex_unlock(&ftdi->u132_lock);
  				msleep(100);
  				mutex_lock(&ftdi->u132_lock);
  				goto wait_2;
  			}
  		}
  	}
  	ftdi->received = 0;
  	ftdi->expected = 4;
  	ftdi->ed_found = 0;
  	mutex_unlock(&ftdi->u132_lock);
  }
  
  static void ftdi_elan_cancel_targets(struct usb_ftdi *ftdi)
  {
  	int ed_number = 4;
  	mutex_lock(&ftdi->u132_lock);
  	while (ed_number-- > 0) {
  		struct u132_target *target = &ftdi->target[ed_number];
  		target->abandoning = 1;
  	wait:if (target->active == 1) {
  			int command_size = ftdi->command_next -
  				ftdi->command_head;
  			if (command_size < COMMAND_SIZE) {
  				struct u132_command *command = &ftdi->command[
  					COMMAND_MASK & ftdi->command_next];
  				command->header = 0x80 | (ed_number << 5) | 0x4;
  				command->length = 0x00;
  				command->address = 0x00;
  				command->width = 0x00;
  				command->follows = 0;
  				command->value = 0;
  				command->buffer = &command->value;
  				ftdi->command_next += 1;
  				ftdi_elan_kick_command_queue(ftdi);
  			} else {
  				mutex_unlock(&ftdi->u132_lock);
  				msleep(100);
  				mutex_lock(&ftdi->u132_lock);
  				goto wait;
  			}
  		}
  	}
  	ftdi->received = 0;
  	ftdi->expected = 4;
  	ftdi->ed_found = 0;
  	mutex_unlock(&ftdi->u132_lock);
  }
  
  static void ftdi_elan_kick_command_queue(struct usb_ftdi *ftdi)
  {
  	ftdi_command_queue_work(ftdi, 0);
  }
  
  static void ftdi_elan_command_work(struct work_struct *work)
  {
  	struct usb_ftdi *ftdi =
  		container_of(work, struct usb_ftdi, command_work.work);
  
  	if (ftdi->disconnected > 0) {
  		ftdi_elan_put_kref(ftdi);
  		return;
  	} else {
  		int retval = ftdi_elan_command_engine(ftdi);
  		if (retval == -ESHUTDOWN) {
  			ftdi->disconnected += 1;
  		} else if (retval == -ENODEV) {
  			ftdi->disconnected += 1;
  		} else if (retval)
  			dev_err(&ftdi->udev->dev, "command error %d\n", retval);
  		ftdi_command_requeue_work(ftdi, msecs_to_jiffies(10));
  		return;
  	}
  }
  
  static void ftdi_elan_kick_respond_queue(struct usb_ftdi *ftdi)
  {
  	ftdi_respond_queue_work(ftdi, 0);
  }
  
  static void ftdi_elan_respond_work(struct work_struct *work)
  {
  	struct usb_ftdi *ftdi =
  		container_of(work, struct usb_ftdi, respond_work.work);
  	if (ftdi->disconnected > 0) {
  		ftdi_elan_put_kref(ftdi);
  		return;
  	} else {
  		int retval = ftdi_elan_respond_engine(ftdi);
  		if (retval == 0) {
  		} else if (retval == -ESHUTDOWN) {
  			ftdi->disconnected += 1;
  		} else if (retval == -ENODEV) {
  			ftdi->disconnected += 1;
  		} else if (retval == -EILSEQ) {
  			ftdi->disconnected += 1;
  		} else {
  			ftdi->disconnected += 1;
  			dev_err(&ftdi->udev->dev, "respond error %d\n", retval);
  		}
  		if (ftdi->disconnected > 0) {
  			ftdi_elan_abandon_completions(ftdi);
  			ftdi_elan_abandon_targets(ftdi);
  		}
  		ftdi_response_requeue_work(ftdi, msecs_to_jiffies(10));
  		return;
  	}
  }
  
  
  /*
   * the sw_lock is initially held and will be freed
   * after the FTDI has been synchronized
   *
   */
  static void ftdi_elan_status_work(struct work_struct *work)
  {
  	struct usb_ftdi *ftdi =
  		container_of(work, struct usb_ftdi, status_work.work);
  	int work_delay_in_msec = 0;
  	if (ftdi->disconnected > 0) {
  		ftdi_elan_put_kref(ftdi);
  		return;
  	} else if (ftdi->synchronized == 0) {
  		down(&ftdi->sw_lock);
  		if (ftdi_elan_synchronize(ftdi) == 0) {
  			ftdi->synchronized = 1;
  			ftdi_command_queue_work(ftdi, 1);
  			ftdi_respond_queue_work(ftdi, 1);
  			up(&ftdi->sw_lock);
  			work_delay_in_msec = 100;
  		} else {
  			dev_err(&ftdi->udev->dev, "synchronize failed\n");
  			up(&ftdi->sw_lock);
  			work_delay_in_msec = 10 *1000;
  		}
  	} else if (ftdi->stuck_status > 0) {
  		if (ftdi_elan_stuck_waiting(ftdi) == 0) {
  			ftdi->stuck_status = 0;
  			ftdi->synchronized = 0;
  		} else if ((ftdi->stuck_status++ % 60) == 1) {
  			dev_err(&ftdi->udev->dev, "WRONG type of card inserted - please remove\n");
  		} else
  			dev_err(&ftdi->udev->dev, "WRONG type of card inserted - checked %d times\n",
  				ftdi->stuck_status);
  		work_delay_in_msec = 100;
  	} else if (ftdi->enumerated == 0) {
  		if (ftdi_elan_enumeratePCI(ftdi) == 0) {
  			ftdi->enumerated = 1;
  			work_delay_in_msec = 250;
  		} else
  			work_delay_in_msec = 1000;
  	} else if (ftdi->initialized == 0) {
  		if (ftdi_elan_setupOHCI(ftdi) == 0) {
  			ftdi->initialized = 1;
  			work_delay_in_msec = 500;
  		} else {
  			dev_err(&ftdi->udev->dev, "initialized failed - trying again in 10 seconds\n");
  			work_delay_in_msec = 1 *1000;
  		}
  	} else if (ftdi->registered == 0) {
  		work_delay_in_msec = 10;
  		if (ftdi_elan_hcd_init(ftdi) == 0) {
  			ftdi->registered = 1;
  		} else
  			dev_err(&ftdi->udev->dev, "register failed\n");
  		work_delay_in_msec = 250;
  	} else {
  		if (ftdi_elan_checkingPCI(ftdi) == 0) {
  			work_delay_in_msec = 250;
  		} else if (ftdi->controlreg & 0x00400000) {
  			if (ftdi->gone_away > 0) {
  				dev_err(&ftdi->udev->dev, "PCI device eject confirmed platform_dev.dev.parent=%p platform_dev.dev=%p\n",
  					ftdi->platform_dev.dev.parent,
  					&ftdi->platform_dev.dev);
  				platform_device_unregister(&ftdi->platform_dev);
  				ftdi->platform_dev.dev.parent = NULL;
  				ftdi->registered = 0;
  				ftdi->enumerated = 0;
  				ftdi->card_ejected = 0;
  				ftdi->initialized = 0;
  				ftdi->gone_away = 0;
  			} else
  				ftdi_elan_flush_targets(ftdi);
  			work_delay_in_msec = 250;
  		} else {
  			dev_err(&ftdi->udev->dev, "PCI device has disappeared\n");
  			ftdi_elan_cancel_targets(ftdi);
  			work_delay_in_msec = 500;
  			ftdi->enumerated = 0;
  			ftdi->initialized = 0;
  		}
  	}
  	if (ftdi->disconnected > 0) {
  		ftdi_elan_put_kref(ftdi);
  		return;
  	} else {
  		ftdi_status_requeue_work(ftdi,
  					 msecs_to_jiffies(work_delay_in_msec));
  		return;
  	}
  }
  
  
  /*
   * file_operations for the jtag interface
   *
   * the usage count for the device is incremented on open()
   * and decremented on release()
   */
  static int ftdi_elan_open(struct inode *inode, struct file *file)
  {
  	int subminor;
  	struct usb_interface *interface;
  
  	subminor = iminor(inode);
  	interface = usb_find_interface(&ftdi_elan_driver, subminor);
  
  	if (!interface) {
  		pr_err("can't find device for minor %d\n", subminor);
  		return -ENODEV;
  	} else {
  		struct usb_ftdi *ftdi = usb_get_intfdata(interface);
  		if (!ftdi) {
  			return -ENODEV;
  		} else {
  			if (down_interruptible(&ftdi->sw_lock)) {
  				return -EINTR;
  			} else {
  				ftdi_elan_get_kref(ftdi);
  				file->private_data = ftdi;
  				return 0;
  			}
  		}
  	}
  }
  
  static int ftdi_elan_release(struct inode *inode, struct file *file)
  {
  	struct usb_ftdi *ftdi = file->private_data;
  	if (ftdi == NULL)
  		return -ENODEV;
  	up(&ftdi->sw_lock);        /* decrement the count on our device */
  	ftdi_elan_put_kref(ftdi);
  	return 0;
  }
  
  
  /*
   *
   * blocking bulk reads are used to get data from the device
   *
   */
  static ssize_t ftdi_elan_read(struct file *file, char __user *buffer,
  			      size_t count, loff_t *ppos)
  {
  	char data[30 *3 + 4];
  	char *d = data;
  	int m = (sizeof(data) - 1) / 3 - 1;
  	int bytes_read = 0;
  	int retry_on_empty = 10;
  	int retry_on_timeout = 5;
  	struct usb_ftdi *ftdi = file->private_data;
  	if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	}
  	data[0] = 0;
  have:if (ftdi->bulk_in_left > 0) {
  		if (count-- > 0) {
  			char *p = ++ftdi->bulk_in_last + ftdi->bulk_in_buffer;
  			ftdi->bulk_in_left -= 1;
  			if (bytes_read < m) {
  				d += sprintf(d, " %02X", 0x000000FF & *p);
  			} else if (bytes_read > m) {
  			} else
  				d += sprintf(d, " ..");
  			if (copy_to_user(buffer++, p, 1)) {
  				return -EFAULT;
  			} else {
  				bytes_read += 1;
  				goto have;
  			}
  		} else
  			return bytes_read;
  	}
  more:if (count > 0) {
  		int packet_bytes = 0;
  		int retval = usb_bulk_msg(ftdi->udev,
  					  usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
  					  ftdi->bulk_in_buffer, ftdi->bulk_in_size,
  					  &packet_bytes, 50);
  		if (packet_bytes > 2) {
  			ftdi->bulk_in_left = packet_bytes - 2;
  			ftdi->bulk_in_last = 1;
  			goto have;
  		} else if (retval == -ETIMEDOUT) {
  			if (retry_on_timeout-- > 0) {
  				goto more;
  			} else if (bytes_read > 0) {
  				return bytes_read;
  			} else
  				return retval;
  		} else if (retval == 0) {
  			if (retry_on_empty-- > 0) {
  				goto more;
  			} else
  				return bytes_read;
  		} else
  			return retval;
  	} else
  		return bytes_read;
  }
  
  static void ftdi_elan_write_bulk_callback(struct urb *urb)
  {
  	struct usb_ftdi *ftdi = urb->context;
  	int status = urb->status;
  
  	if (status && !(status == -ENOENT || status == -ECONNRESET ||
  			status == -ESHUTDOWN)) {
  		dev_err(&ftdi->udev->dev,
  			"urb=%p write bulk status received: %d\n", urb, status);
  	}
  	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
  			  urb->transfer_buffer, urb->transfer_dma);
  }
  
  static int fill_buffer_with_all_queued_commands(struct usb_ftdi *ftdi,
  						char *buf, int command_size, int total_size)
  {
  	int ed_commands = 0;
  	int b = 0;
  	int I = command_size;
  	int i = ftdi->command_head;
  	while (I-- > 0) {
  		struct u132_command *command = &ftdi->command[COMMAND_MASK &
  							      i++];
  		int F = command->follows;
  		u8 *f = command->buffer;
  		if (command->header & 0x80) {
  			ed_commands |= 1 << (0x3 & (command->header >> 5));
  		}
  		buf[b++] = command->header;
  		buf[b++] = (command->length >> 0) & 0x00FF;
  		buf[b++] = (command->length >> 8) & 0x00FF;
  		buf[b++] = command->address;
  		buf[b++] = command->width;
  		while (F-- > 0) {
  			buf[b++] = *f++;
  		}
  	}
  	return ed_commands;
  }
  
  static int ftdi_elan_total_command_size(struct usb_ftdi *ftdi, int command_size)
  {
  	int total_size = 0;
  	int I = command_size;
  	int i = ftdi->command_head;
  	while (I-- > 0) {
  		struct u132_command *command = &ftdi->command[COMMAND_MASK &
  							      i++];
  		total_size += 5 + command->follows;
  	} return total_size;
  }
  
  static int ftdi_elan_command_engine(struct usb_ftdi *ftdi)
  {
  	int retval;
  	char *buf;
  	int ed_commands;
  	int total_size;
  	struct urb *urb;
  	int command_size = ftdi->command_next - ftdi->command_head;
  	if (command_size == 0)
  		return 0;
  	total_size = ftdi_elan_total_command_size(ftdi, command_size);
  	urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!urb)
  		return -ENOMEM;
  	buf = usb_alloc_coherent(ftdi->udev, total_size, GFP_KERNEL,
  				 &urb->transfer_dma);
  	if (!buf) {
  		dev_err(&ftdi->udev->dev, "could not get a buffer to write %d commands totaling %d bytes to the Uxxx\n",
  			command_size, total_size);
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  	ed_commands = fill_buffer_with_all_queued_commands(ftdi, buf,
  							   command_size, total_size);
  	usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
  							   ftdi->bulk_out_endpointAddr), buf, total_size,
  			  ftdi_elan_write_bulk_callback, ftdi);
  	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  	if (ed_commands) {
  		char diag[40 *3 + 4];
  		char *d = diag;
  		int m = total_size;
  		u8 *c = buf;
  		int s = (sizeof(diag) - 1) / 3;
  		diag[0] = 0;
  		while (s-- > 0 && m-- > 0) {
  			if (s > 0 || m == 0) {
  				d += sprintf(d, " %02X", *c++);
  			} else
  				d += sprintf(d, " ..");
  		}
  	}
  	retval = usb_submit_urb(urb, GFP_KERNEL);
  	if (retval) {
  		dev_err(&ftdi->udev->dev, "failed %d to submit urb %p to write %d commands totaling %d bytes to the Uxxx\n",
  			retval, urb, command_size, total_size);
  		usb_free_coherent(ftdi->udev, total_size, buf, urb->transfer_dma);
  		usb_free_urb(urb);
  		return retval;
  	}
  	usb_free_urb(urb);        /* release our reference to this urb,
  				     the USB core will eventually free it entirely */
  	ftdi->command_head += command_size;
  	ftdi_elan_kick_respond_queue(ftdi);
  	return 0;
  }
  
  static void ftdi_elan_do_callback(struct usb_ftdi *ftdi,
  				  struct u132_target *target, u8 *buffer, int length)
  {
  	struct urb *urb = target->urb;
  	int halted = target->halted;
  	int skipped = target->skipped;
  	int actual = target->actual;
  	int non_null = target->non_null;
  	int toggle_bits = target->toggle_bits;
  	int error_count = target->error_count;
  	int condition_code = target->condition_code;
  	int repeat_number = target->repeat_number;
  	void (*callback) (void *, struct urb *, u8 *, int, int, int, int, int,
  			  int, int, int, int) = target->callback;
  	target->active -= 1;
  	target->callback = NULL;
  	(*callback) (target->endp, urb, buffer, length, toggle_bits,
  		     error_count, condition_code, repeat_number, halted, skipped,
  		     actual, non_null);
  }
  
  static char *have_ed_set_response(struct usb_ftdi *ftdi,
  				  struct u132_target *target, u16 ed_length, int ed_number, int ed_type,
  				  char *b)
  {
  	int payload = (ed_length >> 0) & 0x07FF;
  	mutex_lock(&ftdi->u132_lock);
  	target->actual = 0;
  	target->non_null = (ed_length >> 15) & 0x0001;
  	target->repeat_number = (ed_length >> 11) & 0x000F;
  	if (ed_type == 0x02 || ed_type == 0x03) {
  		if (payload == 0 || target->abandoning > 0) {
  			target->abandoning = 0;
  			mutex_unlock(&ftdi->u132_lock);
  			ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
  					      payload);
  			ftdi->received = 0;
  			ftdi->expected = 4;
  			ftdi->ed_found = 0;
  			return ftdi->response;
  		} else {
  			ftdi->expected = 4 + payload;
  			ftdi->ed_found = 1;
  			mutex_unlock(&ftdi->u132_lock);
  			return b;
  		}
  	} else {
  		target->abandoning = 0;
  		mutex_unlock(&ftdi->u132_lock);
  		ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
  				      payload);
  		ftdi->received = 0;
  		ftdi->expected = 4;
  		ftdi->ed_found = 0;
  		return ftdi->response;
  	}
  }
  
  static char *have_ed_get_response(struct usb_ftdi *ftdi,
  				  struct u132_target *target, u16 ed_length, int ed_number, int ed_type,
  				  char *b)
  {
  	mutex_lock(&ftdi->u132_lock);
  	target->condition_code = TD_DEVNOTRESP;
  	target->actual = (ed_length >> 0) & 0x01FF;
  	target->non_null = (ed_length >> 15) & 0x0001;
  	target->repeat_number = (ed_length >> 11) & 0x000F;
  	mutex_unlock(&ftdi->u132_lock);
  	if (target->active)
  		ftdi_elan_do_callback(ftdi, target, NULL, 0);
  	target->abandoning = 0;
  	ftdi->received = 0;
  	ftdi->expected = 4;
  	ftdi->ed_found = 0;
  	return ftdi->response;
  }
  
  
  /*
   * The engine tries to empty the FTDI fifo
   *
   * all responses found in the fifo data are dispatched thus
   * the response buffer can only ever hold a maximum sized
   * response from the Uxxx.
   *
   */
  static int ftdi_elan_respond_engine(struct usb_ftdi *ftdi)
  {
  	u8 *b = ftdi->response + ftdi->received;
  	int bytes_read = 0;
  	int retry_on_empty = 1;
  	int retry_on_timeout = 3;
  read:{
  		int packet_bytes = 0;
  		int retval = usb_bulk_msg(ftdi->udev,
  					  usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
  					  ftdi->bulk_in_buffer, ftdi->bulk_in_size,
  					  &packet_bytes, 500);
  		char diag[30 *3 + 4];
  		char *d = diag;
  		int m = packet_bytes;
  		u8 *c = ftdi->bulk_in_buffer;
  		int s = (sizeof(diag) - 1) / 3;
  		diag[0] = 0;
  		while (s-- > 0 && m-- > 0) {
  			if (s > 0 || m == 0) {
  				d += sprintf(d, " %02X", *c++);
  			} else
  				d += sprintf(d, " ..");
  		}
  		if (packet_bytes > 2) {
  			ftdi->bulk_in_left = packet_bytes - 2;
  			ftdi->bulk_in_last = 1;
  			goto have;
  		} else if (retval == -ETIMEDOUT) {
  			if (retry_on_timeout-- > 0) {
  				dev_err(&ftdi->udev->dev, "TIMED OUT with packet_bytes = %d with total %d bytes%s\n",
  					packet_bytes, bytes_read, diag);
  				goto more;
  			} else if (bytes_read > 0) {
  				dev_err(&ftdi->udev->dev, "ONLY %d bytes%s\n",
  					bytes_read, diag);
  				return -ENOMEM;
  			} else {
  				dev_err(&ftdi->udev->dev, "TIMED OUT with packet_bytes = %d with total %d bytes%s\n",
  					packet_bytes, bytes_read, diag);
  				return -ENOMEM;
  			}
  		} else if (retval == -EILSEQ) {
  			dev_err(&ftdi->udev->dev, "error = %d with packet_bytes = %d with total %d bytes%s\n",
  				retval, packet_bytes, bytes_read, diag);
  			return retval;
  		} else if (retval) {
  			dev_err(&ftdi->udev->dev, "error = %d with packet_bytes = %d with total %d bytes%s\n",
  				retval, packet_bytes, bytes_read, diag);
  			return retval;
  		} else {
  			if (retry_on_empty-- > 0) {
  				goto more;
  			} else
  				return 0;
  		}
  	}
  more:{
  		goto read;
  	}
  have:if (ftdi->bulk_in_left > 0) {
  		u8 c = ftdi->bulk_in_buffer[++ftdi->bulk_in_last];
  		bytes_read += 1;
  		ftdi->bulk_in_left -= 1;
  		if (ftdi->received == 0 && c == 0xFF) {
  			goto have;
  		} else
  			*b++ = c;
  		if (++ftdi->received < ftdi->expected) {
  			goto have;
  		} else if (ftdi->ed_found) {
  			int ed_number = (ftdi->response[0] >> 5) & 0x03;
  			u16 ed_length = (ftdi->response[2] << 8) |
  				ftdi->response[1];
  			struct u132_target *target = &ftdi->target[ed_number];
  			int payload = (ed_length >> 0) & 0x07FF;
  			char diag[30 *3 + 4];
  			char *d = diag;
  			int m = payload;
  			u8 *c = 4 + ftdi->response;
  			int s = (sizeof(diag) - 1) / 3;
  			diag[0] = 0;
  			while (s-- > 0 && m-- > 0) {
  				if (s > 0 || m == 0) {
  					d += sprintf(d, " %02X", *c++);
  				} else
  					d += sprintf(d, " ..");
  			}
  			ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
  					      payload);
  			ftdi->received = 0;
  			ftdi->expected = 4;
  			ftdi->ed_found = 0;
  			b = ftdi->response;
  			goto have;
  		} else if (ftdi->expected == 8) {
  			u8 buscmd;
  			int respond_head = ftdi->respond_head++;
  			struct u132_respond *respond = &ftdi->respond[
  				RESPOND_MASK & respond_head];
  			u32 data = ftdi->response[7];
  			data <<= 8;
  			data |= ftdi->response[6];
  			data <<= 8;
  			data |= ftdi->response[5];
  			data <<= 8;
  			data |= ftdi->response[4];
  			*respond->value = data;
  			*respond->result = 0;
  			complete(&respond->wait_completion);
  			ftdi->received = 0;
  			ftdi->expected = 4;
  			ftdi->ed_found = 0;
  			b = ftdi->response;
  			buscmd = (ftdi->response[0] >> 0) & 0x0F;
  			if (buscmd == 0x00) {
  			} else if (buscmd == 0x02) {
  			} else if (buscmd == 0x06) {
  			} else if (buscmd == 0x0A) {
  			} else
  				dev_err(&ftdi->udev->dev, "Uxxx unknown(%0X) value = %08X\n",
  					buscmd, data);
  			goto have;
  		} else {
  			if ((ftdi->response[0] & 0x80) == 0x00) {
  				ftdi->expected = 8;
  				goto have;
  			} else {
  				int ed_number = (ftdi->response[0] >> 5) & 0x03;
  				int ed_type = (ftdi->response[0] >> 0) & 0x03;
  				u16 ed_length = (ftdi->response[2] << 8) |
  					ftdi->response[1];
  				struct u132_target *target = &ftdi->target[
  					ed_number];
  				target->halted = (ftdi->response[0] >> 3) &
  					0x01;
  				target->skipped = (ftdi->response[0] >> 2) &
  					0x01;
  				target->toggle_bits = (ftdi->response[3] >> 6)
  					& 0x03;
  				target->error_count = (ftdi->response[3] >> 4)
  					& 0x03;
  				target->condition_code = (ftdi->response[
  								  3] >> 0) & 0x0F;
  				if ((ftdi->response[0] & 0x10) == 0x00) {
  					b = have_ed_set_response(ftdi, target,
  								 ed_length, ed_number, ed_type,
  								 b);
  					goto have;
  				} else {
  					b = have_ed_get_response(ftdi, target,
  								 ed_length, ed_number, ed_type,
  								 b);
  					goto have;
  				}
  			}
  		}
  	} else
  		goto more;
  }
  
  
  /*
   * create a urb, and a buffer for it, and copy the data to the urb
   *
   */
  static ssize_t ftdi_elan_write(struct file *file,
  			       const char __user *user_buffer, size_t count,
  			       loff_t *ppos)
  {
  	int retval = 0;
  	struct urb *urb;
  	char *buf;
  	struct usb_ftdi *ftdi = file->private_data;
  
  	if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	}
  	if (count == 0) {
  		goto exit;
  	}
  	urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!urb) {
  		retval = -ENOMEM;
  		goto error_1;
  	}
  	buf = usb_alloc_coherent(ftdi->udev, count, GFP_KERNEL,
  				 &urb->transfer_dma);
  	if (!buf) {
  		retval = -ENOMEM;
  		goto error_2;
  	}
  	if (copy_from_user(buf, user_buffer, count)) {
  		retval = -EFAULT;
  		goto error_3;
  	}
  	usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
  							   ftdi->bulk_out_endpointAddr), buf, count,
  			  ftdi_elan_write_bulk_callback, ftdi);
  	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  	retval = usb_submit_urb(urb, GFP_KERNEL);
  	if (retval) {
  		dev_err(&ftdi->udev->dev,
  			"failed submitting write urb, error %d\n", retval);
  		goto error_3;
  	}
  	usb_free_urb(urb);
  
  exit:
  	return count;
  error_3:
  	usb_free_coherent(ftdi->udev, count, buf, urb->transfer_dma);
  error_2:
  	usb_free_urb(urb);
  error_1:
  	return retval;
  }
  
  static const struct file_operations ftdi_elan_fops = {
  	.owner = THIS_MODULE,
  	.llseek = no_llseek,
  	.read = ftdi_elan_read,
  	.write = ftdi_elan_write,
  	.open = ftdi_elan_open,
  	.release = ftdi_elan_release,
  };
  
  /*
   * usb class driver info in order to get a minor number from the usb core,
   * and to have the device registered with the driver core
   */
  static struct usb_class_driver ftdi_elan_jtag_class = {
  	.name = "ftdi-%d-jtag",
  	.fops = &ftdi_elan_fops,
  	.minor_base = USB_FTDI_ELAN_MINOR_BASE,
  };
  
  /*
   * the following definitions are for the
   * ELAN FPGA state machgine processor that
   * lies on the other side of the FTDI chip
   */
  #define cPCIu132rd 0x0
  #define cPCIu132wr 0x1
  #define cPCIiord 0x2
  #define cPCIiowr 0x3
  #define cPCImemrd 0x6
  #define cPCImemwr 0x7
  #define cPCIcfgrd 0xA
  #define cPCIcfgwr 0xB
  #define cPCInull 0xF
  #define cU132cmd_status 0x0
  #define cU132flash 0x1
  #define cPIDsetup 0x0
  #define cPIDout 0x1
  #define cPIDin 0x2
  #define cPIDinonce 0x3
  #define cCCnoerror 0x0
  #define cCCcrc 0x1
  #define cCCbitstuff 0x2
  #define cCCtoggle 0x3
  #define cCCstall 0x4
  #define cCCnoresp 0x5
  #define cCCbadpid1 0x6
  #define cCCbadpid2 0x7
  #define cCCdataoverrun 0x8
  #define cCCdataunderrun 0x9
  #define cCCbuffoverrun 0xC
  #define cCCbuffunderrun 0xD
  #define cCCnotaccessed 0xF
  static int ftdi_elan_write_reg(struct usb_ftdi *ftdi, u32 data)
  {
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			command->header = 0x00 | cPCIu132wr;
  			command->length = 0x04;
  			command->address = 0x00;
  			command->width = 0x00;
  			command->follows = 4;
  			command->value = data;
  			command->buffer = &command->value;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  static int ftdi_elan_write_config(struct usb_ftdi *ftdi, int config_offset,
  				  u8 width, u32 data)
  {
  	u8 addressofs = config_offset / 4;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			command->header = 0x00 | (cPCIcfgwr & 0x0F);
  			command->length = 0x04;
  			command->address = addressofs;
  			command->width = 0x00 | (width & 0x0F);
  			command->follows = 4;
  			command->value = data;
  			command->buffer = &command->value;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  static int ftdi_elan_write_pcimem(struct usb_ftdi *ftdi, int mem_offset,
  				  u8 width, u32 data)
  {
  	u8 addressofs = mem_offset / 4;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			command->header = 0x00 | (cPCImemwr & 0x0F);
  			command->length = 0x04;
  			command->address = addressofs;
  			command->width = 0x00 | (width & 0x0F);
  			command->follows = 4;
  			command->value = data;
  			command->buffer = &command->value;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  int usb_ftdi_elan_write_pcimem(struct platform_device *pdev, int mem_offset,
  			       u8 width, u32 data)
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	return ftdi_elan_write_pcimem(ftdi, mem_offset, width, data);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_write_pcimem);
  static int ftdi_elan_read_reg(struct usb_ftdi *ftdi, u32 *data)
  {
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		int respond_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		respond_size = ftdi->respond_next - ftdi->respond_head;
  		if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
  		{
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			struct u132_respond *respond = &ftdi->respond[
  				RESPOND_MASK & ftdi->respond_next];
  			int result = -ENODEV;
  			respond->result = &result;
  			respond->header = command->header = 0x00 | cPCIu132rd;
  			command->length = 0x04;
  			respond->address = command->address = cU132cmd_status;
  			command->width = 0x00;
  			command->follows = 0;
  			command->value = 0;
  			command->buffer = NULL;
  			respond->value = data;
  			init_completion(&respond->wait_completion);
  			ftdi->command_next += 1;
  			ftdi->respond_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			wait_for_completion(&respond->wait_completion);
  			return result;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  static int ftdi_elan_read_config(struct usb_ftdi *ftdi, int config_offset,
  				 u8 width, u32 *data)
  {
  	u8 addressofs = config_offset / 4;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		int respond_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		respond_size = ftdi->respond_next - ftdi->respond_head;
  		if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
  		{
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			struct u132_respond *respond = &ftdi->respond[
  				RESPOND_MASK & ftdi->respond_next];
  			int result = -ENODEV;
  			respond->result = &result;
  			respond->header = command->header = 0x00 | (cPCIcfgrd &
  								    0x0F);
  			command->length = 0x04;
  			respond->address = command->address = addressofs;
  			command->width = 0x00 | (width & 0x0F);
  			command->follows = 0;
  			command->value = 0;
  			command->buffer = NULL;
  			respond->value = data;
  			init_completion(&respond->wait_completion);
  			ftdi->command_next += 1;
  			ftdi->respond_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			wait_for_completion(&respond->wait_completion);
  			return result;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  static int ftdi_elan_read_pcimem(struct usb_ftdi *ftdi, int mem_offset,
  				 u8 width, u32 *data)
  {
  	u8 addressofs = mem_offset / 4;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		int respond_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		respond_size = ftdi->respond_next - ftdi->respond_head;
  		if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
  		{
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			struct u132_respond *respond = &ftdi->respond[
  				RESPOND_MASK & ftdi->respond_next];
  			int result = -ENODEV;
  			respond->result = &result;
  			respond->header = command->header = 0x00 | (cPCImemrd &
  								    0x0F);
  			command->length = 0x04;
  			respond->address = command->address = addressofs;
  			command->width = 0x00 | (width & 0x0F);
  			command->follows = 0;
  			command->value = 0;
  			command->buffer = NULL;
  			respond->value = data;
  			init_completion(&respond->wait_completion);
  			ftdi->command_next += 1;
  			ftdi->respond_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			wait_for_completion(&respond->wait_completion);
  			return result;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  int usb_ftdi_elan_read_pcimem(struct platform_device *pdev, int mem_offset,
  			      u8 width, u32 *data)
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	if (ftdi->initialized == 0) {
  		return -ENODEV;
  	} else
  		return ftdi_elan_read_pcimem(ftdi, mem_offset, width, data);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_read_pcimem);
  static int ftdi_elan_edset_setup(struct usb_ftdi *ftdi, u8 ed_number,
  				 void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  				 void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						   int toggle_bits, int error_count, int condition_code, int repeat_number,
  						   int halted, int skipped, int actual, int non_null))
  {
  	u8 ed = ed_number - 1;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else if (ftdi->initialized == 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			struct u132_target *target = &ftdi->target[ed];
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			command->header = 0x80 | (ed << 5);
  			command->length = 0x8007;
  			command->address = (toggle_bits << 6) | (ep_number << 2)
  				| (address << 0);
  			command->width = usb_maxpacket(urb->dev, urb->pipe,
  						       usb_pipeout(urb->pipe));
  			command->follows = 8;
  			command->value = 0;
  			command->buffer = urb->setup_packet;
  			target->callback = callback;
  			target->endp = endp;
  			target->urb = urb;
  			target->active = 1;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  int usb_ftdi_elan_edset_setup(struct platform_device *pdev, u8 ed_number,
  			      void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  			      void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						int toggle_bits, int error_count, int condition_code, int repeat_number,
  						int halted, int skipped, int actual, int non_null))
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	return ftdi_elan_edset_setup(ftdi, ed_number, endp, urb, address,
  				     ep_number, toggle_bits, callback);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_setup);
  static int ftdi_elan_edset_input(struct usb_ftdi *ftdi, u8 ed_number,
  				 void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  				 void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						   int toggle_bits, int error_count, int condition_code, int repeat_number,
  						   int halted, int skipped, int actual, int non_null))
  {
  	u8 ed = ed_number - 1;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else if (ftdi->initialized == 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			struct u132_target *target = &ftdi->target[ed];
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			u32 remaining_length = urb->transfer_buffer_length -
  				urb->actual_length;
  			command->header = 0x82 | (ed << 5);
  			if (remaining_length == 0) {
  				command->length = 0x0000;
  			} else if (remaining_length > 1024) {
  				command->length = 0x8000 | 1023;
  			} else
  				command->length = 0x8000 | (remaining_length -
  							    1);
  			command->address = (toggle_bits << 6) | (ep_number << 2)
  				| (address << 0);
  			command->width = usb_maxpacket(urb->dev, urb->pipe,
  						       usb_pipeout(urb->pipe));
  			command->follows = 0;
  			command->value = 0;
  			command->buffer = NULL;
  			target->callback = callback;
  			target->endp = endp;
  			target->urb = urb;
  			target->active = 1;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  int usb_ftdi_elan_edset_input(struct platform_device *pdev, u8 ed_number,
  			      void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  			      void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						int toggle_bits, int error_count, int condition_code, int repeat_number,
  						int halted, int skipped, int actual, int non_null))
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	return ftdi_elan_edset_input(ftdi, ed_number, endp, urb, address,
  				     ep_number, toggle_bits, callback);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_input);
  static int ftdi_elan_edset_empty(struct usb_ftdi *ftdi, u8 ed_number,
  				 void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  				 void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						   int toggle_bits, int error_count, int condition_code, int repeat_number,
  						   int halted, int skipped, int actual, int non_null))
  {
  	u8 ed = ed_number - 1;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else if (ftdi->initialized == 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			struct u132_target *target = &ftdi->target[ed];
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			command->header = 0x81 | (ed << 5);
  			command->length = 0x0000;
  			command->address = (toggle_bits << 6) | (ep_number << 2)
  				| (address << 0);
  			command->width = usb_maxpacket(urb->dev, urb->pipe,
  						       usb_pipeout(urb->pipe));
  			command->follows = 0;
  			command->value = 0;
  			command->buffer = NULL;
  			target->callback = callback;
  			target->endp = endp;
  			target->urb = urb;
  			target->active = 1;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  int usb_ftdi_elan_edset_empty(struct platform_device *pdev, u8 ed_number,
  			      void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  			      void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						int toggle_bits, int error_count, int condition_code, int repeat_number,
  						int halted, int skipped, int actual, int non_null))
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	return ftdi_elan_edset_empty(ftdi, ed_number, endp, urb, address,
  				     ep_number, toggle_bits, callback);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_empty);
  static int ftdi_elan_edset_output(struct usb_ftdi *ftdi, u8 ed_number,
  				  void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  				  void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						    int toggle_bits, int error_count, int condition_code, int repeat_number,
  						    int halted, int skipped, int actual, int non_null))
  {
  	u8 ed = ed_number - 1;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else if (ftdi->initialized == 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			u8 *b;
  			u16 urb_size;
  			int i = 0;
  			char data[30 *3 + 4];
  			char *d = data;
  			int m = (sizeof(data) - 1) / 3 - 1;
  			int l = 0;
  			struct u132_target *target = &ftdi->target[ed];
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			command->header = 0x81 | (ed << 5);
  			command->address = (toggle_bits << 6) | (ep_number << 2)
  				| (address << 0);
  			command->width = usb_maxpacket(urb->dev, urb->pipe,
  						       usb_pipeout(urb->pipe));
  			command->follows = min_t(u32, 1024,
  						 urb->transfer_buffer_length -
  						 urb->actual_length);
  			command->value = 0;
  			command->buffer = urb->transfer_buffer +
  				urb->actual_length;
  			command->length = 0x8000 | (command->follows - 1);
  			b = command->buffer;
  			urb_size = command->follows;
  			data[0] = 0;
  			while (urb_size-- > 0) {
  				if (i > m) {
  				} else if (i++ < m) {
  					int w = sprintf(d, " %02X", *b++);
  					d += w;
  					l += w;
  				} else
  					d += sprintf(d, " ..");
  			}
  			target->callback = callback;
  			target->endp = endp;
  			target->urb = urb;
  			target->active = 1;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  int usb_ftdi_elan_edset_output(struct platform_device *pdev, u8 ed_number,
  			       void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  			       void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						 int toggle_bits, int error_count, int condition_code, int repeat_number,
  						 int halted, int skipped, int actual, int non_null))
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	return ftdi_elan_edset_output(ftdi, ed_number, endp, urb, address,
  				      ep_number, toggle_bits, callback);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_output);
  static int ftdi_elan_edset_single(struct usb_ftdi *ftdi, u8 ed_number,
  				  void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  				  void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						    int toggle_bits, int error_count, int condition_code, int repeat_number,
  						    int halted, int skipped, int actual, int non_null))
  {
  	u8 ed = ed_number - 1;
  wait:if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else if (ftdi->initialized == 0) {
  		return -ENODEV;
  	} else {
  		int command_size;
  		mutex_lock(&ftdi->u132_lock);
  		command_size = ftdi->command_next - ftdi->command_head;
  		if (command_size < COMMAND_SIZE) {
  			u32 remaining_length = urb->transfer_buffer_length -
  				urb->actual_length;
  			struct u132_target *target = &ftdi->target[ed];
  			struct u132_command *command = &ftdi->command[
  				COMMAND_MASK & ftdi->command_next];
  			command->header = 0x83 | (ed << 5);
  			if (remaining_length == 0) {
  				command->length = 0x0000;
  			} else if (remaining_length > 1024) {
  				command->length = 0x8000 | 1023;
  			} else
  				command->length = 0x8000 | (remaining_length -
  							    1);
  			command->address = (toggle_bits << 6) | (ep_number << 2)
  				| (address << 0);
  			command->width = usb_maxpacket(urb->dev, urb->pipe,
  						       usb_pipeout(urb->pipe));
  			command->follows = 0;
  			command->value = 0;
  			command->buffer = NULL;
  			target->callback = callback;
  			target->endp = endp;
  			target->urb = urb;
  			target->active = 1;
  			ftdi->command_next += 1;
  			ftdi_elan_kick_command_queue(ftdi);
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			mutex_unlock(&ftdi->u132_lock);
  			msleep(100);
  			goto wait;
  		}
  	}
  }
  
  int usb_ftdi_elan_edset_single(struct platform_device *pdev, u8 ed_number,
  			       void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
  			       void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
  						 int toggle_bits, int error_count, int condition_code, int repeat_number,
  						 int halted, int skipped, int actual, int non_null))
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	return ftdi_elan_edset_single(ftdi, ed_number, endp, urb, address,
  				      ep_number, toggle_bits, callback);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_single);
  static int ftdi_elan_edset_flush(struct usb_ftdi *ftdi, u8 ed_number,
  				 void *endp)
  {
  	u8 ed = ed_number - 1;
  	if (ftdi->disconnected > 0) {
  		return -ENODEV;
  	} else if (ftdi->initialized == 0) {
  		return -ENODEV;
  	} else {
  		struct u132_target *target = &ftdi->target[ed];
  		mutex_lock(&ftdi->u132_lock);
  		if (target->abandoning > 0) {
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		} else {
  			target->abandoning = 1;
  		wait_1:if (target->active == 1) {
  				int command_size = ftdi->command_next -
  					ftdi->command_head;
  				if (command_size < COMMAND_SIZE) {
  					struct u132_command *command =
  						&ftdi->command[COMMAND_MASK &
  							       ftdi->command_next];
  					command->header = 0x80 | (ed << 5) |
  						0x4;
  					command->length = 0x00;
  					command->address = 0x00;
  					command->width = 0x00;
  					command->follows = 0;
  					command->value = 0;
  					command->buffer = &command->value;
  					ftdi->command_next += 1;
  					ftdi_elan_kick_command_queue(ftdi);
  				} else {
  					mutex_unlock(&ftdi->u132_lock);
  					msleep(100);
  					mutex_lock(&ftdi->u132_lock);
  					goto wait_1;
  				}
  			}
  			mutex_unlock(&ftdi->u132_lock);
  			return 0;
  		}
  	}
  }
  
  int usb_ftdi_elan_edset_flush(struct platform_device *pdev, u8 ed_number,
  			      void *endp)
  {
  	struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
  	return ftdi_elan_edset_flush(ftdi, ed_number, endp);
  }
  
  
  EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_flush);
  static int ftdi_elan_flush_input_fifo(struct usb_ftdi *ftdi)
  {
  	int retry_on_empty = 10;
  	int retry_on_timeout = 5;
  	int retry_on_status = 20;
  more:{
  		int packet_bytes = 0;
  		int retval = usb_bulk_msg(ftdi->udev,
  					  usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
  					  ftdi->bulk_in_buffer, ftdi->bulk_in_size,
  					  &packet_bytes, 100);
  		if (packet_bytes > 2) {
  			char diag[30 *3 + 4];
  			char *d = diag;
  			int m = (sizeof(diag) - 1) / 3 - 1;
  			char *b = ftdi->bulk_in_buffer;
  			int bytes_read = 0;
  			diag[0] = 0;
  			while (packet_bytes-- > 0) {
  				char c = *b++;
  				if (bytes_read < m) {
  					d += sprintf(d, " %02X",
  						     0x000000FF & c);
  				} else if (bytes_read > m) {
  				} else
  					d += sprintf(d, " ..");
  				bytes_read += 1;
  				continue;
  			}
  			goto more;
  		} else if (packet_bytes > 1) {
  			char s1 = ftdi->bulk_in_buffer[0];
  			char s2 = ftdi->bulk_in_buffer[1];
  			if (s1 == 0x31 && s2 == 0x60) {
  				return 0;
  			} else if (retry_on_status-- > 0) {
  				goto more;
  			} else {
  				dev_err(&ftdi->udev->dev, "STATUS ERROR retry limit reached\n");
  				return -EFAULT;
  			}
  		} else if (packet_bytes > 0) {
  			char b1 = ftdi->bulk_in_buffer[0];
  			dev_err(&ftdi->udev->dev, "only one byte flushed from FTDI = %02X\n",
  				b1);
  			if (retry_on_status-- > 0) {
  				goto more;
  			} else {
  				dev_err(&ftdi->udev->dev, "STATUS ERROR retry limit reached\n");
  				return -EFAULT;
  			}
  		} else if (retval == -ETIMEDOUT) {
  			if (retry_on_timeout-- > 0) {
  				goto more;
  			} else {
  				dev_err(&ftdi->udev->dev, "TIMED OUT retry limit reached\n");
  				return -ENOMEM;
  			}
  		} else if (retval == 0) {
  			if (retry_on_empty-- > 0) {
  				goto more;
  			} else {
  				dev_err(&ftdi->udev->dev, "empty packet retry limit reached\n");
  				return -ENOMEM;
  			}
  		} else {
  			dev_err(&ftdi->udev->dev, "error = %d\n", retval);
  			return retval;
  		}
  	}
  	return -1;
  }
  
  
  /*
   * send the long flush sequence
   *
   */
  static int ftdi_elan_synchronize_flush(struct usb_ftdi *ftdi)
  {
  	int retval;
  	struct urb *urb;
  	char *buf;
  	int I = 257;
  	int i = 0;
  	urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!urb)
  		return -ENOMEM;
  	buf = usb_alloc_coherent(ftdi->udev, I, GFP_KERNEL, &urb->transfer_dma);
  	if (!buf) {
  		dev_err(&ftdi->udev->dev, "could not get a buffer for flush sequence\n");
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  	while (I-- > 0)
  		buf[i++] = 0x55;
  	usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
  							   ftdi->bulk_out_endpointAddr), buf, i,
  			  ftdi_elan_write_bulk_callback, ftdi);
  	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  	retval = usb_submit_urb(urb, GFP_KERNEL);
  	if (retval) {
  		dev_err(&ftdi->udev->dev, "failed to submit urb containing the flush sequence\n");
  		usb_free_coherent(ftdi->udev, i, buf, urb->transfer_dma);
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  	usb_free_urb(urb);
  	return 0;
  }
  
  
  /*
   * send the reset sequence
   *
   */
  static int ftdi_elan_synchronize_reset(struct usb_ftdi *ftdi)
  {
  	int retval;
  	struct urb *urb;
  	char *buf;
  	int I = 4;
  	int i = 0;
  	urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!urb)
  		return -ENOMEM;
  	buf = usb_alloc_coherent(ftdi->udev, I, GFP_KERNEL, &urb->transfer_dma);
  	if (!buf) {
  		dev_err(&ftdi->udev->dev, "could not get a buffer for the reset sequence\n");
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  	buf[i++] = 0x55;
  	buf[i++] = 0xAA;
  	buf[i++] = 0x5A;
  	buf[i++] = 0xA5;
  	usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
  							   ftdi->bulk_out_endpointAddr), buf, i,
  			  ftdi_elan_write_bulk_callback, ftdi);
  	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  	retval = usb_submit_urb(urb, GFP_KERNEL);
  	if (retval) {
  		dev_err(&ftdi->udev->dev, "failed to submit urb containing the reset sequence\n");
  		usb_free_coherent(ftdi->udev, i, buf, urb->transfer_dma);
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  	usb_free_urb(urb);
  	return 0;
  }
  
  static int ftdi_elan_synchronize(struct usb_ftdi *ftdi)
  {
  	int retval;
  	int long_stop = 10;
  	int retry_on_timeout = 5;
  	int retry_on_empty = 10;
  	int err_count = 0;
  	retval = ftdi_elan_flush_input_fifo(ftdi);
  	if (retval)
  		return retval;
  	ftdi->bulk_in_left = 0;
  	ftdi->bulk_in_last = -1;
  	while (long_stop-- > 0) {
  		int read_stop;
  		int read_stuck;
  		retval = ftdi_elan_synchronize_flush(ftdi);
  		if (retval)
  			return retval;
  		retval = ftdi_elan_flush_input_fifo(ftdi);
  		if (retval)
  			return retval;
  	reset:retval = ftdi_elan_synchronize_reset(ftdi);
  		if (retval)
  			return retval;
  		read_stop = 100;
  		read_stuck = 10;
  	read:{
  			int packet_bytes = 0;
  			retval = usb_bulk_msg(ftdi->udev,
  					      usb_rcvbulkpipe(ftdi->udev,
  							      ftdi->bulk_in_endpointAddr),
  					      ftdi->bulk_in_buffer, ftdi->bulk_in_size,
  					      &packet_bytes, 500);
  			if (packet_bytes > 2) {
  				char diag[30 *3 + 4];
  				char *d = diag;
  				int m = (sizeof(diag) - 1) / 3 - 1;
  				char *b = ftdi->bulk_in_buffer;
  				int bytes_read = 0;
  				unsigned char c = 0;
  				diag[0] = 0;
  				while (packet_bytes-- > 0) {
  					c = *b++;
  					if (bytes_read < m) {
  						d += sprintf(d, " %02X", c);
  					} else if (bytes_read > m) {
  					} else
  						d += sprintf(d, " ..");
  					bytes_read += 1;
  					continue;
  				}
  				if (c == 0x7E) {
  					return 0;
  				} else {
  					if (c == 0x55) {
  						goto read;
  					} else if (read_stop-- > 0) {
  						goto read;
  					} else {
  						dev_err(&ftdi->udev->dev, "retry limit reached\n");
  						continue;
  					}
  				}
  			} else if (packet_bytes > 1) {
  				unsigned char s1 = ftdi->bulk_in_buffer[0];
  				unsigned char s2 = ftdi->bulk_in_buffer[1];
  				if (s1 == 0x31 && s2 == 0x00) {
  					if (read_stuck-- > 0) {
  						goto read;
  					} else
  						goto reset;
  				} else {
  					if (read_stop-- > 0) {
  						goto read;
  					} else {
  						dev_err(&ftdi->udev->dev, "retry limit reached\n");
  						continue;
  					}
  				}
  			} else if (packet_bytes > 0) {
  				if (read_stop-- > 0) {
  					goto read;
  				} else {
  					dev_err(&ftdi->udev->dev, "retry limit reached\n");
  					continue;
  				}
  			} else if (retval == -ETIMEDOUT) {
  				if (retry_on_timeout-- > 0) {
  					goto read;
  				} else {
  					dev_err(&ftdi->udev->dev, "TIMED OUT retry limit reached\n");
  					continue;
  				}
  			} else if (retval == 0) {
  				if (retry_on_empty-- > 0) {
  					goto read;
  				} else {
  					dev_err(&ftdi->udev->dev, "empty packet retry limit reached\n");
  					continue;
  				}
  			} else {
  				err_count += 1;
  				dev_err(&ftdi->udev->dev, "error = %d\n",
  					retval);
  				if (read_stop-- > 0) {
  					goto read;
  				} else {
  					dev_err(&ftdi->udev->dev, "retry limit reached\n");
  					continue;
  				}
  			}
  		}
  	}
  	dev_err(&ftdi->udev->dev, "failed to synchronize\n");
  	return -EFAULT;
  }
  
  static int ftdi_elan_stuck_waiting(struct usb_ftdi *ftdi)
  {
  	int retry_on_empty = 10;
  	int retry_on_timeout = 5;
  	int retry_on_status = 50;
  more:{
  		int packet_bytes = 0;
  		int retval = usb_bulk_msg(ftdi->udev,
  					  usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
  					  ftdi->bulk_in_buffer, ftdi->bulk_in_size,
  					  &packet_bytes, 1000);
  		if (packet_bytes > 2) {
  			char diag[30 *3 + 4];
  			char *d = diag;
  			int m = (sizeof(diag) - 1) / 3 - 1;
  			char *b = ftdi->bulk_in_buffer;
  			int bytes_read = 0;
  			diag[0] = 0;
  			while (packet_bytes-- > 0) {
  				char c = *b++;
  				if (bytes_read < m) {
  					d += sprintf(d, " %02X",
  						     0x000000FF & c);
  				} else if (bytes_read > m) {
  				} else
  					d += sprintf(d, " ..");
  				bytes_read += 1;
  				continue;
  			}
  			goto more;
  		} else if (packet_bytes > 1) {
  			char s1 = ftdi->bulk_in_buffer[0];
  			char s2 = ftdi->bulk_in_buffer[1];
  			if (s1 == 0x31 && s2 == 0x60) {
  				return 0;
  			} else if (retry_on_status-- > 0) {
  				msleep(5);
  				goto more;
  			} else
  				return -EFAULT;
  		} else if (packet_bytes > 0) {
  			char b1 = ftdi->bulk_in_buffer[0];
  			dev_err(&ftdi->udev->dev, "only one byte flushed from FTDI = %02X\n", b1);
  			if (retry_on_status-- > 0) {
  				msleep(5);
  				goto more;
  			} else {
  				dev_err(&ftdi->udev->dev, "STATUS ERROR retry limit reached\n");
  				return -EFAULT;
  			}
  		} else if (retval == -ETIMEDOUT) {
  			if (retry_on_timeout-- > 0) {
  				goto more;
  			} else {
  				dev_err(&ftdi->udev->dev, "TIMED OUT retry limit reached\n");
  				return -ENOMEM;
  			}
  		} else if (retval == 0) {
  			if (retry_on_empty-- > 0) {
  				goto more;
  			} else {
  				dev_err(&ftdi->udev->dev, "empty packet retry limit reached\n");
  				return -ENOMEM;
  			}
  		} else {
  			dev_err(&ftdi->udev->dev, "error = %d\n", retval);
  			return -ENOMEM;
  		}
  	}
  	return -1;
  }
  
  static int ftdi_elan_checkingPCI(struct usb_ftdi *ftdi)
  {
  	int UxxxStatus = ftdi_elan_read_reg(ftdi, &ftdi->controlreg);
  	if (UxxxStatus)
  		return UxxxStatus;
  	if (ftdi->controlreg & 0x00400000) {
  		if (ftdi->card_ejected) {
  		} else {
  			ftdi->card_ejected = 1;
  			dev_err(&ftdi->udev->dev, "CARD EJECTED - controlreg = %08X\n",
  				ftdi->controlreg);
  		}
  		return -ENODEV;
  	} else {
  		u8 fn = ftdi->function - 1;
  		int activePCIfn = fn << 8;
  		u32 pcidata;
  		u32 pciVID;
  		u32 pciPID;
  		int reg = 0;
  		UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  						   &pcidata);
  		if (UxxxStatus)
  			return UxxxStatus;
  		pciVID = pcidata & 0xFFFF;
  		pciPID = (pcidata >> 16) & 0xFFFF;
  		if (pciVID == ftdi->platform_data.vendor && pciPID ==
  		    ftdi->platform_data.device) {
  			return 0;
  		} else {
  			dev_err(&ftdi->udev->dev, "vendor=%04X pciVID=%04X device=%04X pciPID=%04X\n",
  				ftdi->platform_data.vendor, pciVID,
  				ftdi->platform_data.device, pciPID);
  			return -ENODEV;
  		}
  	}
  }
  
  
  #define ftdi_read_pcimem(ftdi, member, data) ftdi_elan_read_pcimem(ftdi, \
  								   offsetof(struct ohci_regs, member), 0, data);
  #define ftdi_write_pcimem(ftdi, member, data) ftdi_elan_write_pcimem(ftdi, \
  								     offsetof(struct ohci_regs, member), 0, data);
  
  #define OHCI_CONTROL_INIT OHCI_CTRL_CBSR
  #define OHCI_INTR_INIT (OHCI_INTR_MIE | OHCI_INTR_UE | OHCI_INTR_RD |	\
  			OHCI_INTR_WDH)
  static int ftdi_elan_check_controller(struct usb_ftdi *ftdi, int quirk)
  {
  	int devices = 0;
  	int retval;
  	u32 hc_control;
  	int num_ports;
  	u32 control;
  	u32 rh_a = -1;
  	u32 status;
  	u32 fminterval;
  	u32 hc_fminterval;
  	u32 periodicstart;
  	u32 cmdstatus;
  	u32 roothub_a;
  	int mask = OHCI_INTR_INIT;
  	int sleep_time = 0;
  	int reset_timeout = 30;        /* ... allow extra time */
  	int temp;
  	retval = ftdi_write_pcimem(ftdi, intrdisable, OHCI_INTR_MIE);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, control, &control);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, roothub.a, &rh_a);
  	if (retval)
  		return retval;
  	num_ports = rh_a & RH_A_NDP;
  	retval = ftdi_read_pcimem(ftdi, fminterval, &hc_fminterval);
  	if (retval)
  		return retval;
  	hc_fminterval &= 0x3fff;
  	if (hc_fminterval != FI) {
  	}
  	hc_fminterval |= FSMP(hc_fminterval) << 16;
  	retval = ftdi_read_pcimem(ftdi, control, &hc_control);
  	if (retval)
  		return retval;
  	switch (hc_control & OHCI_CTRL_HCFS) {
  	case OHCI_USB_OPER:
  		sleep_time = 0;
  		break;
  	case OHCI_USB_SUSPEND:
  	case OHCI_USB_RESUME:
  		hc_control &= OHCI_CTRL_RWC;
  		hc_control |= OHCI_USB_RESUME;
  		sleep_time = 10;
  		break;
  	default:
  		hc_control &= OHCI_CTRL_RWC;
  		hc_control |= OHCI_USB_RESET;
  		sleep_time = 50;
  		break;
  	}
  	retval = ftdi_write_pcimem(ftdi, control, hc_control);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, control, &control);
  	if (retval)
  		return retval;
  	msleep(sleep_time);
  	retval = ftdi_read_pcimem(ftdi, roothub.a, &roothub_a);
  	if (retval)
  		return retval;
  	if (!(roothub_a & RH_A_NPS)) {        /* power down each port */
  		for (temp = 0; temp < num_ports; temp++) {
  			retval = ftdi_write_pcimem(ftdi,
  						   roothub.portstatus[temp], RH_PS_LSDA);
  			if (retval)
  				return retval;
  		}
  	}
  	retval = ftdi_read_pcimem(ftdi, control, &control);
  	if (retval)
  		return retval;
  retry:retval = ftdi_read_pcimem(ftdi, cmdstatus, &status);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, cmdstatus, OHCI_HCR);
  	if (retval)
  		return retval;
  extra:{
  		retval = ftdi_read_pcimem(ftdi, cmdstatus, &status);
  		if (retval)
  			return retval;
  		if (0 != (status & OHCI_HCR)) {
  			if (--reset_timeout == 0) {
  				dev_err(&ftdi->udev->dev, "USB HC reset timed out!\n");
  				return -ENODEV;
  			} else {
  				msleep(5);
  				goto extra;
  			}
  		}
  	}
  	if (quirk & OHCI_QUIRK_INITRESET) {
  		retval = ftdi_write_pcimem(ftdi, control, hc_control);
  		if (retval)
  			return retval;
  		retval = ftdi_read_pcimem(ftdi, control, &control);
  		if (retval)
  			return retval;
  	}
  	retval = ftdi_write_pcimem(ftdi, ed_controlhead, 0x00000000);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, ed_bulkhead, 0x11000000);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, hcca, 0x00000000);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, fminterval, &fminterval);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, fminterval,
  				   ((fminterval & FIT) ^ FIT) | hc_fminterval);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, periodicstart,
  				   ((9 *hc_fminterval) / 10) & 0x3fff);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, fminterval, &fminterval);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, periodicstart, &periodicstart);
  	if (retval)
  		return retval;
  	if (0 == (fminterval & 0x3fff0000) || 0 == periodicstart) {
  		if (!(quirk & OHCI_QUIRK_INITRESET)) {
  			quirk |= OHCI_QUIRK_INITRESET;
  			goto retry;
  		} else
  			dev_err(&ftdi->udev->dev, "init err(%08x %04x)\n",
  				fminterval, periodicstart);
  	}                        /* start controller operations */
  	hc_control &= OHCI_CTRL_RWC;
  	hc_control |= OHCI_CONTROL_INIT | OHCI_CTRL_BLE | OHCI_USB_OPER;
  	retval = ftdi_write_pcimem(ftdi, control, hc_control);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, cmdstatus, OHCI_BLF);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, cmdstatus, &cmdstatus);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, control, &control);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, roothub.status, RH_HS_DRWE);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, intrstatus, mask);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, intrdisable,
  				   OHCI_INTR_MIE | OHCI_INTR_OC | OHCI_INTR_RHSC | OHCI_INTR_FNO |
  				   OHCI_INTR_UE | OHCI_INTR_RD | OHCI_INTR_SF | OHCI_INTR_WDH |
  				   OHCI_INTR_SO);
  	if (retval)
  		return retval;        /* handle root hub init quirks ... */
  	retval = ftdi_read_pcimem(ftdi, roothub.a, &roothub_a);
  	if (retval)
  		return retval;
  	roothub_a &= ~(RH_A_PSM | RH_A_OCPM);
  	if (quirk & OHCI_QUIRK_SUPERIO) {
  		roothub_a |= RH_A_NOCP;
  		roothub_a &= ~(RH_A_POTPGT | RH_A_NPS);
  		retval = ftdi_write_pcimem(ftdi, roothub.a, roothub_a);
  		if (retval)
  			return retval;
  	} else if ((quirk & OHCI_QUIRK_AMD756) || distrust_firmware) {
  		roothub_a |= RH_A_NPS;
  		retval = ftdi_write_pcimem(ftdi, roothub.a, roothub_a);
  		if (retval)
  			return retval;
  	}
  	retval = ftdi_write_pcimem(ftdi, roothub.status, RH_HS_LPSC);
  	if (retval)
  		return retval;
  	retval = ftdi_write_pcimem(ftdi, roothub.b,
  				   (roothub_a & RH_A_NPS) ? 0 : RH_B_PPCM);
  	if (retval)
  		return retval;
  	retval = ftdi_read_pcimem(ftdi, control, &control);
  	if (retval)
  		return retval;
  	mdelay((roothub_a >> 23) & 0x1fe);
  	for (temp = 0; temp < num_ports; temp++) {
  		u32 portstatus;
  		retval = ftdi_read_pcimem(ftdi, roothub.portstatus[temp],
  					  &portstatus);
  		if (retval)
  			return retval;
  		if (1 & portstatus)
  			devices += 1;
  	}
  	return devices;
  }
  
  static int ftdi_elan_setup_controller(struct usb_ftdi *ftdi, int fn)
  {
  	u32 latence_timer;
  	int UxxxStatus;
  	u32 pcidata;
  	int reg = 0;
  	int activePCIfn = fn << 8;
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x2800);
  	if (UxxxStatus)
  		return UxxxStatus;
  	reg = 16;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
  					    0xFFFFFFFF);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &pcidata);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
  					    0xF0000000);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &pcidata);
  	if (UxxxStatus)
  		return UxxxStatus;
  	reg = 12;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &latence_timer);
  	if (UxxxStatus)
  		return UxxxStatus;
  	latence_timer &= 0xFFFF00FF;
  	latence_timer |= 0x00001600;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
  					    latence_timer);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &pcidata);
  	if (UxxxStatus)
  		return UxxxStatus;
  	reg = 4;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
  					    0x06);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &pcidata);
  	if (UxxxStatus)
  		return UxxxStatus;
  	for (reg = 0; reg <= 0x54; reg += 4) {
  		UxxxStatus = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
  		if (UxxxStatus)
  			return UxxxStatus;
  	}
  	return 0;
  }
  
  static int ftdi_elan_close_controller(struct usb_ftdi *ftdi, int fn)
  {
  	u32 latence_timer;
  	int UxxxStatus;
  	u32 pcidata;
  	int reg = 0;
  	int activePCIfn = fn << 8;
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x2800);
  	if (UxxxStatus)
  		return UxxxStatus;
  	reg = 16;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
  					    0xFFFFFFFF);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &pcidata);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
  					    0x00000000);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &pcidata);
  	if (UxxxStatus)
  		return UxxxStatus;
  	reg = 12;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &latence_timer);
  	if (UxxxStatus)
  		return UxxxStatus;
  	latence_timer &= 0xFFFF00FF;
  	latence_timer |= 0x00001600;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
  					    latence_timer);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  					   &pcidata);
  	if (UxxxStatus)
  		return UxxxStatus;
  	reg = 4;
  	UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
  					    0x00);
  	if (UxxxStatus)
  		return UxxxStatus;
  	return ftdi_elan_read_config(ftdi, activePCIfn | reg, 0, &pcidata);
  }
  
  static int ftdi_elan_found_controller(struct usb_ftdi *ftdi, int fn, int quirk)
  {
  	int result;
  	int UxxxStatus;
  	UxxxStatus = ftdi_elan_setup_controller(ftdi, fn);
  	if (UxxxStatus)
  		return UxxxStatus;
  	result = ftdi_elan_check_controller(ftdi, quirk);
  	UxxxStatus = ftdi_elan_close_controller(ftdi, fn);
  	if (UxxxStatus)
  		return UxxxStatus;
  	return result;
  }
  
  static int ftdi_elan_enumeratePCI(struct usb_ftdi *ftdi)
  {
  	u32 controlreg;
  	u8 sensebits;
  	int UxxxStatus;
  	UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000000L);
  	if (UxxxStatus)
  		return UxxxStatus;
  	msleep(750);
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000200L | 0x100);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000200L | 0x500);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020CL | 0x000);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020DL | 0x000);
  	if (UxxxStatus)
  		return UxxxStatus;
  	msleep(250);
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020FL | 0x000);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x800);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
  	if (UxxxStatus)
  		return UxxxStatus;
  	UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
  	if (UxxxStatus)
  		return UxxxStatus;
  	msleep(1000);
  	sensebits = (controlreg >> 16) & 0x000F;
  	if (0x0D == sensebits)
  		return 0;
  	else
  		return - ENXIO;
  }
  
  static int ftdi_elan_setupOHCI(struct usb_ftdi *ftdi)
  {
  	int UxxxStatus;
  	u32 pcidata;
  	int reg = 0;
  	u8 fn;
  	int activePCIfn = 0;
  	int max_devices = 0;
  	int controllers = 0;
  	int unrecognized = 0;
  	ftdi->function = 0;
  	for (fn = 0; (fn < 4); fn++) {
  		u32 pciVID = 0;
  		u32 pciPID = 0;
  		int devices = 0;
  		activePCIfn = fn << 8;
  		UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
  						   &pcidata);
  		if (UxxxStatus)
  			return UxxxStatus;
  		pciVID = pcidata & 0xFFFF;
  		pciPID = (pcidata >> 16) & 0xFFFF;
  		if ((pciVID == PCI_VENDOR_ID_OPTI) && (pciPID == 0xc861)) {
  			devices = ftdi_elan_found_controller(ftdi, fn, 0);
  			controllers += 1;
  		} else if ((pciVID == PCI_VENDOR_ID_NEC) && (pciPID == 0x0035))
  		{
  			devices = ftdi_elan_found_controller(ftdi, fn, 0);
  			controllers += 1;
  		} else if ((pciVID == PCI_VENDOR_ID_AL) && (pciPID == 0x5237)) {
  			devices = ftdi_elan_found_controller(ftdi, fn, 0);
  			controllers += 1;
  		} else if ((pciVID == PCI_VENDOR_ID_ATT) && (pciPID == 0x5802))
  		{
  			devices = ftdi_elan_found_controller(ftdi, fn, 0);
  			controllers += 1;
  		} else if (pciVID == PCI_VENDOR_ID_AMD && pciPID == 0x740c) {
  			devices = ftdi_elan_found_controller(ftdi, fn,
  							     OHCI_QUIRK_AMD756);
  			controllers += 1;
  		} else if (pciVID == PCI_VENDOR_ID_COMPAQ && pciPID == 0xa0f8) {
  			devices = ftdi_elan_found_controller(ftdi, fn,
  							     OHCI_QUIRK_ZFMICRO);
  			controllers += 1;
  		} else if (0 == pcidata) {
  		} else
  			unrecognized += 1;
  		if (devices > max_devices) {
  			max_devices = devices;
  			ftdi->function = fn + 1;
  			ftdi->platform_data.vendor = pciVID;
  			ftdi->platform_data.device = pciPID;
  		}
  	}
  	if (ftdi->function > 0) {
  		return ftdi_elan_setup_controller(ftdi,	ftdi->function - 1);
  	} else if (controllers > 0) {
  		return -ENXIO;
  	} else if (unrecognized > 0) {
  		return -ENXIO;
  	} else {
  		ftdi->enumerated = 0;
  		return -ENXIO;
  	}
  }
  
  
  /*
   * we use only the first bulk-in and bulk-out endpoints
   */
  static int ftdi_elan_probe(struct usb_interface *interface,
  			   const struct usb_device_id *id)
  {
  	struct usb_host_interface *iface_desc;
  	struct usb_endpoint_descriptor *bulk_in, *bulk_out;
  	int retval;
  	struct usb_ftdi *ftdi;
  
  	ftdi = kzalloc(sizeof(struct usb_ftdi), GFP_KERNEL);
  	if (!ftdi)
  		return -ENOMEM;
  
  	mutex_lock(&ftdi_module_lock);
  	list_add_tail(&ftdi->ftdi_list, &ftdi_static_list);
  	ftdi->sequence_num = ++ftdi_instances;
  	mutex_unlock(&ftdi_module_lock);
  	ftdi_elan_init_kref(ftdi);
  	sema_init(&ftdi->sw_lock, 1);
  	ftdi->udev = usb_get_dev(interface_to_usbdev(interface));
  	ftdi->interface = interface;
  	mutex_init(&ftdi->u132_lock);
  	ftdi->expected = 4;
  
  	iface_desc = interface->cur_altsetting;
  	retval = usb_find_common_endpoints(iface_desc,
  			&bulk_in, &bulk_out, NULL, NULL);
  	if (retval) {
  		dev_err(&ftdi->udev->dev, "Could not find both bulk-in and bulk-out endpoints\n");
  		goto error;
  	}
  
  	ftdi->bulk_in_size = usb_endpoint_maxp(bulk_in);
  	ftdi->bulk_in_endpointAddr = bulk_in->bEndpointAddress;
  	ftdi->bulk_in_buffer = kmalloc(ftdi->bulk_in_size, GFP_KERNEL);
  	if (!ftdi->bulk_in_buffer) {
  		retval = -ENOMEM;
  		goto error;
  	}
  
  	ftdi->bulk_out_endpointAddr = bulk_out->bEndpointAddress;
  
  	dev_info(&ftdi->udev->dev, "interface %d has I=%02X O=%02X\n",
  		 iface_desc->desc.bInterfaceNumber, ftdi->bulk_in_endpointAddr,
  		 ftdi->bulk_out_endpointAddr);
  	usb_set_intfdata(interface, ftdi);
  	if (iface_desc->desc.bInterfaceNumber == 0 &&
  	    ftdi->bulk_in_endpointAddr == 0x81 &&
  	    ftdi->bulk_out_endpointAddr == 0x02) {
  		retval = usb_register_dev(interface, &ftdi_elan_jtag_class);
  		if (retval) {
  			dev_err(&ftdi->udev->dev, "Not able to get a minor for this device\n");
  			usb_set_intfdata(interface, NULL);
  			retval = -ENOMEM;
  			goto error;
  		} else {
  			ftdi->class = &ftdi_elan_jtag_class;
  			dev_info(&ftdi->udev->dev, "USB FDTI=%p JTAG interface %d now attached to ftdi%d\n",
  				 ftdi, iface_desc->desc.bInterfaceNumber,
  				 interface->minor);
  			return 0;
  		}
  	} else if (iface_desc->desc.bInterfaceNumber == 1 &&
  		   ftdi->bulk_in_endpointAddr == 0x83 &&
  		   ftdi->bulk_out_endpointAddr == 0x04) {
  		ftdi->class = NULL;
  		dev_info(&ftdi->udev->dev, "USB FDTI=%p ELAN interface %d now activated\n",
  			 ftdi, iface_desc->desc.bInterfaceNumber);
  		INIT_DELAYED_WORK(&ftdi->status_work, ftdi_elan_status_work);
  		INIT_DELAYED_WORK(&ftdi->command_work, ftdi_elan_command_work);
  		INIT_DELAYED_WORK(&ftdi->respond_work, ftdi_elan_respond_work);
  		ftdi_status_queue_work(ftdi, msecs_to_jiffies(3 *1000));
  		return 0;
  	} else {
  		dev_err(&ftdi->udev->dev,
  			"Could not find ELAN's U132 device\n");
  		retval = -ENODEV;
  		goto error;
  	}
  error:if (ftdi) {
  		ftdi_elan_put_kref(ftdi);
  	}
  	return retval;
  }
  
  static void ftdi_elan_disconnect(struct usb_interface *interface)
  {
  	struct usb_ftdi *ftdi = usb_get_intfdata(interface);
  	ftdi->disconnected += 1;
  	if (ftdi->class) {
  		int minor = interface->minor;
  		struct usb_class_driver *class = ftdi->class;
  		usb_set_intfdata(interface, NULL);
  		usb_deregister_dev(interface, class);
  		dev_info(&ftdi->udev->dev, "USB FTDI U132 jtag interface on minor %d now disconnected\n",
  			 minor);
  	} else {
  		ftdi_status_cancel_work(ftdi);
  		ftdi_command_cancel_work(ftdi);
  		ftdi_response_cancel_work(ftdi);
  		ftdi_elan_abandon_completions(ftdi);
  		ftdi_elan_abandon_targets(ftdi);
  		if (ftdi->registered) {
  			platform_device_unregister(&ftdi->platform_dev);
  			ftdi->synchronized = 0;
  			ftdi->enumerated = 0;
  			ftdi->initialized = 0;
  			ftdi->registered = 0;
  		}
  		ftdi->disconnected += 1;
  		usb_set_intfdata(interface, NULL);
  		dev_info(&ftdi->udev->dev, "USB FTDI U132 host controller interface now disconnected\n");
  	}
  	ftdi_elan_put_kref(ftdi);
  }
  
  static struct usb_driver ftdi_elan_driver = {
  	.name = "ftdi-elan",
  	.probe = ftdi_elan_probe,
  	.disconnect = ftdi_elan_disconnect,
  	.id_table = ftdi_elan_table,
  };
  static int __init ftdi_elan_init(void)
  {
  	int result;
  	pr_info("driver %s\n", ftdi_elan_driver.name);
  	mutex_init(&ftdi_module_lock);
  	INIT_LIST_HEAD(&ftdi_static_list);
  	result = usb_register(&ftdi_elan_driver);
  	if (result) {
  		pr_err("usb_register failed. Error number %d\n", result);
  	}
  	return result;
  
  }
  
  static void __exit ftdi_elan_exit(void)
  {
  	struct usb_ftdi *ftdi;
  	struct usb_ftdi *temp;
  	usb_deregister(&ftdi_elan_driver);
  	pr_info("ftdi_u132 driver deregistered\n");
  	list_for_each_entry_safe(ftdi, temp, &ftdi_static_list, ftdi_list) {
  		ftdi_status_cancel_work(ftdi);
  		ftdi_command_cancel_work(ftdi);
  		ftdi_response_cancel_work(ftdi);
  	}
  }
  
  
  module_init(ftdi_elan_init);
  module_exit(ftdi_elan_exit);
  